Corn grinder



Patented Aug. 17, 1920.'

PNN, M.

stone surfaces.

UNITED :FRED M. LYON, OF PONTIAC, ILLINOIS. p

l ,coitN-GRINDER- Zen of the United States,resid1ing at Pontiac,

' in the :Jounty of'LivingstonandState of Illinois,`have invented certain newand luseful Improvements in Corn-Grinders; 'and I do hereby ideclarethe 'following v,tol'be a full,

clear,'and exact description of thek invention, such .as Will enable others skilled in the'art to `which it appertains to` make andV use the same.` f

This invention relates togrinding 'mills and' more `especially' to those employing `a cone and a shell of hard cast metalfg'andan object of thesame is to produce an improved grinder .forl use Aespeci ally onY softy corn and corn cobs lI have discovered that Vwhen some n'iaterials,"v and more especially corn on" the cob Whilesoft, as is the casewell'up into the spring, are ground in a mill Whoselco-acting ycially in new or soft corn,`and on'accou'nt of the character of cobs Which,"When jsoft,

ordinarily containan abundance of moisture or oils, adhere `more strongly to the faces grinding elements movev over each other Without results. Experiments have shown that such materials, including the oil therein, adhere muchmore strongly to cast and hardened metallic surfaces of burs thanto Efforts to avoid or to over# come this difiiculty vhave been made along the lines of changing the material of the elements, altering their relative position and lspeed and direction of rotation, deepening and changing the shape and direction of the grooves, and enlargingy and changing thel shape and direction of the ridges; but, as the difficulty persisted after these experiments had been made singly and collectively, I Was forced to the conclusion that it Was the nature of the faces of the metal over the ridges and in the grooves, more than the shape of either of the latter, that produced the adhesion of the ground cobs. I may say that to an extent also the same difficulty is found in other materials Which are ground, but as it is more prevalent in corn and cobs, I referl more especially thereto herein.

I have noticed that this difficulty was not so pronounced with older machines, despite` the fact that these may be quite dull; yet

",Specicaton of'Letteirs4 Patent. Pateited A11gi,;'177,:11920, Application `1ed"0"cto'ber 19,'1916. Serial No.'126,604.

i'vhen' they `are sharpened thedffi'culty Was hardly apparent. VSo I`have'-bee11forced"to theconclusionwhich I have Vverified by ex- "per1'ment,that it is theiroughness of the faces ofthe castings, moreespeciallyiron castings, Whichjhas its effect onthe groundy "material and causes the choking 'up ofthe grooves. "I'therefore grindv or polish said faces of hardca'stmetallic burs throughout before settingthe machine to'work atall,

and' the result ris that the pulp if We "maycall it such passes much more freely thro'im'hthemill and the Work of the same i isiexpe'ditedto 'alarge degree, by 'reason of the resulting elimination ofv theV tendency to corrosion and retention of components of the material under treatment.

.vfThelfolloWin'g specification describes the invention-asapplied to a popularform'of 5 R ."ferring tothe accompanying drawings: Figure ll is `a plan.'l viewof the/conical shell.

" Fig. "2 is'a4 pl'anview of; the -`co-actingface of the cone which isintendedto berotated Within said shell.

and therefore effectively spiral paths I)l Which are nearly fiat toward the small end of these elements and slightly tangential thereto, and Which paths fade away or merge into a single circle at the larger end of each element, leaving decided burs or angles A at the outer corners of the Paths. In the faces of these paths beginning near `the'small end of each element are formed grooves G Which Y y such mills,but I donot Wish to be limited inV v metal: faces'ha've burs or ridges with' grooves that respect. H

lbetween them,the groundfmaterialsyby r'ea-V extend thence to the circle at the larger end of the element, and in the ridges `of these grooves beginning yet nearer said circle are formed smaller or sub-grooves G which extend thence to said circle and divide the ridges at this end of each element. Such is my preferred manner of forming the elements .of the mill, one being the female and the other male, and as is Well-known they are nested, andfone is held fixed lWhile thel other .is rotated, or both may be rotated if i.

desired. These Aiaths and grooves may be forined in the act of casting the elements, or in doing so they may be shaped and afterward finished by grinding; but the present invention consists in grinding v into the grooves and upoii the faces of all ridges to sucli an extent that they niay be said to rbe polished, and this polishing is done before.

the inill is set to work at all. 4I wish to distinguish between'polishing and grinding By the latter terni as einployed herein I inean such grinding as may rbe usedvto foi-In or to dee )en the 0rooves and therefore to forni or to shape up .the ridges, but which does not reinove the roughness ythat is left iny iron castings. Iy the terni polishing I desire to be understood to vcover the grinding of the surfaces of the ridges and also the bottoms of the grooves to such an extent and in such a inann'er that all the rough. or pitted surfaces on the grindingy faces ofthe burs are highly polishedinuch the saine as they appear in. a .inillrafter This it has been used for a long time. Y polishing is done by a `special corunduni Awheel in a special inanner forming no part of the present invention, but I have found ythat a grinding machine so treated as to remove as far as` reasonably practicable vall fine obstructions which would .be likely to retain or hold anyr moist or oily product froin the cast hard metallic working faces ofV the bur's before it is put 'to Work does not possess the objections first stated" above.

vVhat I claini is:y f

l. A cast metal grinding, element for grinding soft grain and i cobs, having a grinding surface inclined to the axis of the element, the grinding surface being provided with relatively large spaced inclined ridges decreasing in depth from the feed toward the discharge ends, the surface of the grind-` ing elenieiit between said 'ridges being grooved to forni lesser ridges, all the ridges having sharp cutting edges, and the op- Y erative surface of the eleincnt,fincluding all the ridges .and depressed surfaces, being ground and polished throughout.

j2. A cast metal grinding element for grinding soft grain and cobs, having a grinding surface inclined to the axis of the element, the grinding surface being provided with relatively large spaced inclined ridges decreasing in depth from the feed towardtlie 'discharge ends, thesurface of the grinding element' between said ridges being rgrooved to forni lesser ridges, allrof said ridgesbe-v the ridges `from the feed toward the discharge ends thereof, alltlie ridges having Asharp cuttingedges, and the operative surface of the elcinent, including all the ridges and depressed surfaces,being ground and polished throughout.

FRED M. LYON. e

. ing fornied with increased'spacing between Y includingga `coacting cone and shell, eachV 

